Compressor device and a cooler thereby used

Abstract

A compressor device with at least two compressor elements connected in series and at least two coolers of which there at least two split coolers that are split in separate successive stages, respectively a hot stage and a cold stage, that are connected together in one or more separate cooling circuits such that the compressed gas is cooled sufficiently between the compressor elements with a minimum coolant flow rate to keep the temperature of the cooled gas at the outlet of each cooler below a maximum permissible value and thereby to realize a desired temperature increase of the coolant in at least one of the aforementioned cooling circuits.

Description

[0001]The present invention relates to a compressor device.[0002]More specifically the invention concerns a compressor device for compressing gas in two or more stages, whereby this compressor device comprises at least two compressor elements connected in series and at least two coolers for cooling the compressed gas, i.e. an intercooler between each of two successive compressor elements and, if need be depending on the configuration, an aftercooler downstream from the last compressor element, whereby each cooler is provided with a primary section through which the compressed gas to be cooled is guided and a secondary section that is in heat-exchanging in contact with the primary section and through which coolant is guided.BACKGROUND OF THE INVENTION[0003]It is known that a gas that is compressed in a compressor element undergoes a substantial temperature increase.[0004]For compressor devices with a number of stages, as referred to here, the compressed gas is supplied from a compres...

AI Technical Summary

Benefits of technology

The present invention aims to solve disadvantages in compressor cooling by considering compression efficiency and heat recovery, rather than focusing solely on compression efficiency. The coolant flow rate is adjusted to the highest possible temperature of the compressed gas at the inlet of the compressor element, taking into account the maximum temperature allowed for good operation of the compressor. The use of straight partitions in the separating system provides an advantage.

Problems solved by technology

It is also known to cool the compressed gas after the last compressor element before the gas is supplied to the consumer network because otherwise damage could occur to the consumers in the network on account of too high temperatures.

Such a parallel supply of the coolers is highly suitable for optimum compression efficiency but requires a relatively high coolant flow rate for a sufficient supply of coolant to each cooler, which has the disadvantage that such a parallel supply is not optimum with regard to the required pumping power and size of the required cooling circuit and coolers.

Another disadvantage is that the flow rate of the coolant that flows through the coolers must be kept relatively high to bring about maximum cooling, such that the temperature of the coolant when leaving the compressor device is relatively low and as a result is poorly suited for recovering heat therefrom, for example in the form of the provision of hot water or similar.

Moreover, a high flow rate of the coolant also results in high investment costs, high operating costs and high maintenance costs of the cooling installation.

For the purpose of better heat recovery it could be chosen to reduce the flow rate that is driven in parallel through the coolers and thereby increase the temperature of the coolant at the output, but this would be at the expense of the cooling and thus the compression efficiency.

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